A point object is placed at a distance of 30 cm from a convex mirror of focal le

Question

A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at

Options:

A . Infinity

B . Focus

C . Pole

D . 15 cm behind the mirror

Answer: Option D
:
D

u=-30 cm, f= $\pm$ 30 cm, by using mirror formula
$\frac{1}{f} = \frac{1}{v} + \frac{1}{u} \Rightarrow \frac{1}{+ 30} = \frac{1}{v} + \frac{1}{(- 30)}$
v=15cm, behing the mirror

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